Lipids, Although there is four classes of macromolecules that constitute all living matter: Carbohydrates, Lipids, Proteins, and Nucleic acids. Best answer i'd go with is, Lipids.
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cells needing energy and doing work
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A water reservoir is an artificial lake where water is stored, so the closest would be C.
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Explanation: Melanocytes are melanin-producing cells derived from immature melanocytes or the so-called melanoblasts, which migrate from the neural crest during embryogenesis. Follicular melanocytes show cyclical activation, and “melanogenesis” (to produce melanin) is coupled with anagen in so-called anagen-coupled melanogenesis.